I haven't been making them for long at all.
My first successful set were Louise's, and those were part twisted, part naturals, for reference:

I only ever tried once before, and that was with use of the washing machine which ruined them, so I don't use the washing machine, and i don't use hot water, i just use my flat irons like i do for everything.

I backcomb, then palmroll, then seal, then palmroll, seal, palmroll etc.
Trim them a little bit, with the ends, I twist the dreads ever so slightly and seal, like you would with a twisted dread but nowhere near as much twisting.

I am suuuper happy with how the blonde/white set came out, its exactly what I had envisioned, and also really made myself want a fall like that xD

The last set, might end up being made into a full dread kit if she likes them enough to install them, which'll be cool as i haven't yet done a natural install, or whole dreadkit =]